I totally agree with the post above.
I was also in nursing school for a year but when I realized I liked dentistry better, I immediately switched my major and opted for a bio major pre-dental.
The nursing curriculum is huge and very difficult to bear. So don't even think about adding pre-med courses to it!
Sincerely, my advice to you, leave nursing and go for dentistry. It's a much better choice and if you want it, you'll get it.
I struggled a little with some of the pre-med requirements but you have to keep the big picture in mind at all time.
I got into 4 dental schools, among the best in the nation.
So see, if you want it, you can do it.
Best of luck to you.